Siru
Siru (Korean: 시루) is an earthenware steamer used to steam grain or grain flour dishes such as tteok (rice cakes), most notably siru-tteok. The siru is an earthenware steaming vessel that dates back to the late bronze age of the Korean northern peninsula and the use of the utensil spread to the entire peninsula by the time of the Three Kingdoms in which the popularity of siru-tteok grew.